3 x 3 = 9
4 x 4 =16
9 is closer to 12 than 16 so the answer is 9.
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The closest whole number square root is 12, since 12 x 12 = 144. The next closest are 13 x 13 = 169 or 11 x 11 = 121.
21 is not the square of an integer. The closest square number is 25.
The square root of 15 being 3.87 the closest whole number would be 4
12
196